1401989 has 2 divisors, whose sum is σ = 1401990. Its totient is φ = 1401988.

The previous prime is 1401979. The next prime is 1402003. The reversal of 1401989 is 9891041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399489 + 2500 = 1183^2 + 50^2 .

It is an emirp because it is prime and its reverse (9891041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1401989 - 2¹⁶ = 1336453 is a prime.

It is a super-2 number, since 2×1401989² = 3931146312242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1401949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700994 + 700995.

It is an arithmetic number, because the mean of its divisors is an integer number (700995).

2^1401989 is an apocalyptic number.

It is an amenable number.

1401989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401989 is an equidigital number, since it uses as much as digits as its factorization.

1401989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1401989 is about 1184.0561642084. The cubic root of 1401989 is about 111.9218470511.

The spelling of 1401989 in words is "one million, four hundred one thousand, nine hundred eighty-nine".